Raphael, D. D. (1994). Moral philosophy. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Raphael, D. D. Moral Philosophy. Oxford: Oxford University Press, 1994.
Lua MLA (9ú heag.)Raphael, D. D. Moral Philosophy. Oxford University Press, 1994.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.